IBM ThinkPad 340 Series Hardware Maintenance Manual page 49

Symptom/Error
No beep during POST, but
system runs correctly.
LCD Related Symptoms
Symptom/Error
Flicker
No beep, power-on indicator
on, and a blank LCD during
POST.
LCD backlight not
working
LCD too dark
LCD brightness cannot
be adjusted
LCD contrast cannot
be adjusted.
LCD screen
unreadable, or
Characters missing
pels, or
Screen abnormal, or
Wrong characters
displayed.
LCD has extra horizontal or
vertical lines displayed.
LCD FRU Replacement Notice:
discolored dots appear on the LCD, carefully read the
following note to determine whether you should replace the
LCD.
Do not replace the LCD for defective pixels if dots
that are less than half the area of a pixel are
defective (a total of 11 dots are allowed).
The LCD is not defective if the dots are functional but
are slightly different in color from the immediate,
surrounding area or appear as a "stain".
FRU/Action
1. Turn the volume up
and listen to the
speaker.
2. Speaker
FRU/Action
1. Do not replace any
FRUs. In certain
brightness/contrast
settings, screen flicker
can be seen because
of technical limitations.
1. System Board
1. Reseat the LCD
connector. (See
"1090 LCD Assembly"
on page 55.)
2. LCD Assembly
1. Reseat the LCD
connector. (See
"1090 LCD Assembly"
on page 55.)
2. System Board
3. LCD Assembly
1. LCD Assembly
ThinkPad 340x (IBM 2610)
If missing or
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